05:58Tweet of the DayLesser Black-backed GullBBC Radio 4 Duration: 2 minutes Tue 23rd Jul 2013, 05:58 on BBC Radio 4 LWAvailable for over a yearListen nowSteve Backshall presents the story and sound of the lesser black-backed gull. Show more GenresFactualScience & NatureBrandTweet of the Day Source: BBC Online